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Mote Marine: Three types of radio systems are used aboard boats; two of these are designed and licensed specifically for mote marine use. The third is the Citizens Band radio system.
VHF-FM mote marine radios are considered to be the prime system for mote marine communications over distances of up to about 30 miles. There are 50 channels in the VHP band dedicated to various mote marine uses in U.S. waters. Some are for communications between vessels, and these are divided between commercial and non-commercial (recreational) craft. Several are for special uses, such as navigational safety and direct bridge-to-bridge communications (see below). Some are for the exclusive use of the Coast Guard and other governmental entities. Others are for linkup with shoreside telephone systems. There also are channels for contact with shoreside facilities such as marinas and yacht clubs.This group is commonly made up of the turtles and terrapins, both of which are called turtles and are aquatic or semiaquatic; tortoises, which are strictly terrestrial; and certain turtles which are mote marine. As good pet material does not come from the mote marine turtles, they are not discussed here.
Perhaps the oddest of the mote marine snails are the carrier shells (Xenophora) which gather and attach to themselves other dead shells, bits of coral and stones. Viewed from above, the carrier shell resembles a pile of mote marine debris, and this peculiar habit is believed to be of camouflage or protective value to the animal. The animal holds the edge of its shell to the foreign object and secretes from the fleshy mantle liquid calcium carbonate which soon hardens to form the permanent attachment. The four families of mote marine snails most sought after by collectors of sea shells are the cones (Conidae), cowries (Cypraeidae), volutes (Volu-tidae) and the olive shells (Olividae). |
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